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⇱ paizaでインラインアセンブラ その3 #GCC - Qiita


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@ohisama@github

paizaでインラインアセンブラ その3

1
Last updated at Posted at 2018-12-05

概要

x64で、インラインアセンブラやってみた。
九九やってみた。

結果

 1 2 3 4 5 6 7 8 9 
 1 1 2 3 4 5 6 7 8 9 
 2 2 4 6 8 10 12 14 16 18 
 3 3 6 9 12 15 18 21 24 27 
 4 4 8 12 16 20 24 28 32 36 
 5 5 10 15 20 25 30 35 40 45 
 6 6 12 18 24 30 36 42 48 54 
 7 7 14 21 28 35 42 49 56 63 
 8 8 16 24 32 40 48 56 64 72 
 9 9 18 27 36 45 54 63 72 81 

サンプルコード

# include <stdio.h>
int kakeru( int a, int b)
{
 __asm__ volatile ("imul %2, %0;" 
 : "=r" (a) 
 : "0" (a), "r" (b) 
 : ); 
 return a;
}
int main(void)
{
 int i, 
 j;
 printf (" ");
 for (i = 1; i < 10; i++) 
 {
 printf ("%2d ", i);
 }
 printf ("\n");
 for (j = 1; j < 10; j++) 
 {
 printf ("%2d ", j);
 for (i = 1; i < 10; i++) 
 {
 printf ("%2d ", kakeru(i, j));
 }
 printf ("\n");
 }
}


成果物

以上。

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